Resuming between scenes

SimplesApps · April 2013

Hi all,

I was wondering is there a way to implement a game scene can be stopped and then can return to the same state after all (that the scene can resume), with SceneManager. For example, in a game level screen (scene) the user presses an options button and then the game goes to another different scene; after the user change some setting (or not) then he selects to continue the game and he could continue the game in the same point he left (the scene for the level screen with their event listeners, etc. as were left). As SceneManager does everytime you change from one scene to another, the new scene is created from scratch (the events are created again, etc.).

I guess one approach is to save and manage globally the different scene objects but I want to know if there is an implemented class or useful function (or code snippet) to do this.

Thanks.

ar2rsawseen · April 2013

Yes probably globally would be an easy workaround.
Like have a global variable ggameScene

so you could save the state as:

function gameScene:saveState()
    ggameScene = self
end

then when you create actually scene you could check something like that

function gameScene:init()
    --if there is anything in global state
    if(ggameScene ~= nil)then
       --iterate through all objects and add to current scene
       for i = 1, ggameScene:getNumChildren() do
	self:addChild(ggameScene:getChildAt(i))
       end
    else
        --initiate scene normally
    end
end

And finally to destroy the scene

function gameScene:destroy()
    ggameScene = nil
end

Thats only the idea, haven't tested that, yet

bowerandy · April 2013

@SimplesApps, I'm not sure whether this helps but here's some info about a "popup" class that I created some time ago. Using this, you can keep a scene around while you launch another "sub scene" (the popup) and then when this is dismissed you are back in the original scene again.

http://www.giderosmobile.com/forum/discussion/1194/popup-in-scene-manager#Item_11

Best regards

SimplesApps · April 2013

Thanks Andy, you're simply the best!

I need to pause/resume the state between scenes but your "popup" implementation could be a solution. In fact, I have used until now the Popup class included in the @ar2rsawseen GameTemplate for a similar requirement but I had to get the control over the event listeners,etc by myself.

In your BhPopup I have seen you have implemented a "ignoreTouches" method for that purpose. That's ok for the background buttons (or other objects) but I need to add event listeners and others objects also in the foreground popup. Anyway I have to test it.

Btw, I appreciate a lot your help. Reading your blog, posts and comments I've learned a lot.

Best regards,
David (@SimplesApps).

SimplesApps · April 2013

Andy, I forget to mention your id @bowerandy in order you receive the notice of my last post.

SimplesApps · April 2013

An also I forget to give the thanks to @ar2rsawseen.

I think these kind of functions (stopping/resuming the state) could be added to the Game Template.

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